# Ant Control & Ant Exterminator in Illinois | Illinois Pest Control

> Ant control in Illinois: common ants (odorous house, pavement, carpenter), why trails return, prevention, $100 to $500 typical cost, and when to call.

URL: https://illinoispestcontrol.us/ant-control/

Illinois Pest Control is an independent referral service that connects Illinois property owners with participating providers for **ant control**. Most ant problems are a nuisance; carpenter ants are the exception, because their nests can damage wood. Knowing which ant you have changes what helps.

## Common ants in Illinois homes

University of Illinois Extension lists pavement ants, odorous house ants, carpenter ants, and pharaoh ants among the most common ants in the state. A few identifying points from Extension:

- **Odorous house ants:** about 1/8 inch, brownish-black, and smell like rotten coconut when crushed. They nest under rocks and debris and sometimes in walls and floors, and they eat sweets, meats, and dairy.
- **Pavement ants:** dark brown-black, about 1/6 inch, often coming up through cracks in slabs and driveways.
- **Carpenter ants:** usually black and much larger, 1/4 to 3/4 inch. According to [Extension](https://extension.illinois.edu/insects/carpenter-ants), they don't eat wood, but they hollow it out for nests, and they're drawn to moisture: bathrooms, basements, sump areas, leaking pipes, and crawl spaces.

## Why ant trails keep coming back

The ants you see are foragers from a colony you usually can't. Wiping a trail away or spraying the ants in view rarely reaches the colony, and some sprays scatter it. Ants return when the food, water, or shelter that drew them is still there, which is why sanitation and sealing are the first steps.

Carpenter ants inside in late winter or early spring, or piles of fine wood shavings (frass), can mean a nest indoors. That's worth an inspection, because the nest is often tied to a moisture problem in the structure.

## Prevention that actually helps

These steps make your home less attractive to ants:

- Store sweets, pet food, and pantry items in sealed containers; clean up crumbs and spills promptly.
- Fix leaks and reduce moisture, especially around sinks, windows, and basements.
- Trim branches and shrubs touching the house; they're ant highways.
- Seal cracks around doors, windows, and utility entries.
- Keep firewood and mulch away from the foundation.

## What professional ant control usually involves

A provider will identify the species, find where the ants are entering and nesting, and choose an approach to match: baits that foragers carry back to the colony, targeted treatments at entry points, or locating and treating a carpenter ant nest. For carpenter ants, fixing the moisture source matters as much as the treatment.

## When to call about ants

- Ants keep returning after you've cleaned and sealed obvious entry points.
- You see large black ants indoors, especially in late winter or spring.
- You find fine sawdust-like shavings near wood trim, windows, or in the basement.
- Ants are in several rooms or inside walls.
- You manage a rental, restaurant, or business with ongoing ant activity.

## What ant control costs

HomeAdvisor's June 2026 data lists ant control at **$100 to $500**, with the overall average pest control service at $172. Carpenter ant work that involves finding and treating a nest inside the structure tends to cost more than treating nuisance ants.

- **Species:** carpenter ants usually cost more than pavement or odorous house ants.
- **Nest location:** nests inside walls take more work to reach.
- **Follow-up:** baits work over days to weeks and may need a return visit.
- **Moisture repairs:** fixing leaks or rotted wood is separate.

## What you can do right now

1. Note where the ants appear and the size and color of the ants.
2. Clean the trail and any food source with soap and water.
3. Seal food and pet food in containers.
4. Check for leaks or damp wood near where you see them.
5. If you see large black ants or wood shavings, call for an inspection.

## Questions to ask before you hire

- Is your business licensed by the Illinois Department of Public Health, and what is the license number? Who is the certified technician?
- What species do you think this is, and how does that change the treatment?
- Will you use baits, sprays, or both, and where?
- If these are carpenter ants, will you look for the nest and the moisture source?
- Is a follow-up visit included?

## FAQ

**How much does an ant exterminator cost in Illinois?**

HomeAdvisor's June 2026 national data lists ant control at $100 to $500. Carpenter ant work that requires finding a nest in the structure usually costs more than treating nuisance ants.

**Are carpenter ants as bad as termites?**

They're different. University of Illinois Extension notes carpenter ants don't eat wood the way termites do, but they hollow it out for nests and are drawn to moist wood, so they can damage structures and point to a moisture problem.

**Why do ants come back after I spray them?**

The ants you see are foragers from a hidden colony. Spraying them rarely reaches the colony and can scatter it. Removing food and water sources, sealing entry points, and baits that reach the colony work better.

**What ant smells like coconut?**

The odorous house ant. University of Illinois Extension describes it as a small brownish-black ant that smells like rotten coconut when crushed.

Referral disclosure: Illinois Pest Control is an independent contractor-referral service. We help connect Illinois homeowners and property owners with participating pest control professionals. Services are performed by independent providers. We may receive compensation for qualified referrals. Phone: (217) 626-5123.